| 组别 | 湿度状态 | 粒径范围/mm | 平均粒径d/mm |
| G1 | 干燥 | 0.075~0.25 | 0.163 |
| G2 | 干燥 | 0.25~0.5 | 0.375 |
| G3 | 干燥 | 0.5~1.0 | 0.750 |
| G4 | 干燥 | 1.0~2.0 | 1.500 |
| G5 | 潮湿 | 0.075~0.25 | 0.163 |
| G6 | 潮湿 | 0.25~0.5 | 0.375 |
| G7 | 潮湿 | 0.5~1.0 | 0.750 |
| G8 | 潮湿 | 1.0~2.0 | 1.500 |
| G9 | 饱和 | 0.075~0.25 | 0.163 |
| G10 | 饱和 | 0.25~0.5 | 0.375 |
| G11 | 饱和 | 0.5~1.0 | 0.750 |
| G12 | 饱和 | 1.0~2.0 | 1.500 |